Are you sure you want to use the Glenn style? In my opinion, long titles look specially ugly (not that short ones are pretty).
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Gonzalo MedinaApr 30 '13 at 22:34

@GonzaloMedina What do you recommend? I am writing a report and I don't want to use the ugly default one.
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Jeel ShahApr 30 '13 at 22:39

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If you want a framed title, I would suggest you to use the titlesec package. Let me provide an answer with both options.
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Gonzalo MedinaApr 30 '13 at 22:46

@GonzaloMedina Okay great. I would like to have a professional looking report as much as possible.
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Jeel ShahApr 30 '13 at 22:47

I have provided an example of a framed title using titlesec. However, if you are looking for a professional report, I would suggest you not to use frames at all. The documentation for the memoir document class has several chapter styles that might give you some good ideas for your titles.
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Gonzalo MedinaApr 30 '13 at 23:00

1 Answer
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The quickest way is to patch the appropriate commands. To change the spacing before the titles, you need to patch \@makechapterhead (for numbered chapters) and \@makeschapterhead (for unnumbered chapters); to change the spacing after the tiles, you need to patch \DOTI (for numbered chapters) and \DOTIS (for unnumbered chapters). A little example (the second argument for \patchcmd contains the default values; the third argument, the modified values):

However, I would suggest you not to use this style; long titles won't look good, You could consider using a framed title built with the help of the titlesec package; here's a simple example (the vertical spacing before and after the title is set using the second and third arguments for \titlespacing*):

Is it possible to decrease the size from the top? The report I am writing has specific page constraints and the space that is left at the top can be used for information :)
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Jeel ShahApr 30 '13 at 23:01

@gekkostate Sure; you can use a negative value for the length in the second argument for \titlespacing*.
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Gonzalo MedinaApr 30 '13 at 23:02